悠闲数学娱乐论坛(第3版)»论坛 › 数学区 › 初等数学讨论 › 三角不等式 $\sum\cos^2A\ge4\sum\cos^2A\cos^2B$

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[不等式] 三角不等式 $\sum\cos^2A\ge4\sum\cos^2A\cos^2B$

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hjfmhh Post time 2016-4-8 15:22 |Read mode

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kuing Post time 2016-4-8 15:25

见《撸题集》第427页证法二

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